Bottles containing C₆H₅I and C₆H₅CH₂I lost their original labels. They were labeled as A and B respectively for testing. A and B were separately taken in a test tube and boiled with NaOH solution. The end solution in each test tube was made acidic with dilute HNO₃ and then some AgNO₃ was added. A substance present in test tube B gave a yellow precipitate. The true statement among the following regarding the experiment is:
1. A was C₆H₅I 
2. A was C₆H₅CH₂I 
3. B was C₆H₅I 
4. Addition of HNO₃ was unnecessary 

S_N1  reaction is feasible in:

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